AUIRF4905S P-Channel MOSFET - 55V 42A Power Transistor D2PAK
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AUIRF4905S P-Channel MOSFET | 55V 42A Automotive-Grade Power Transistor in D2PAK
The AUIRF4905S is a 55V P-Channel power MOSFET in the D2PAK (TO-263) surface-mount package, automotive-grade qualified for repetitive avalanche capability and 175°C operation. P-channel MOSFETs are the high-side switch of choice for power-management circuits where a single supply rail simplifies gate-drive design — common on motor controllers, battery protection circuits, and reverse-polarity protection blocks.
Headline specs: VDS 55V, ID 42A continuous (70A pulsed), RDS(on) 20mΩ at VGS = 10V, Qg 120nC typical, ±20V VGS range, 170W power dissipation, 175°C operation.
When You Need the AUIRF4905S
- High-side switch failure on motor controllers, EV power management, or DC distribution.
- Battery protection circuit repair — failed P-channel pass element.
- Reverse-polarity protection block needs replacement after a wrong-polarity event.
- Visible damage on the D2PAK package — burnt or cracked.
AUIRF4905S Specifications
| Parameter | Specification |
|---|---|
| Type | P-Channel MOSFET |
| VDS (Drain-Source Voltage) | 55V |
| ID (Continuous Drain Current) | 42A |
| ID (Pulsed) | 70A |
| RDS(on) @ VGS = 10V | 20mΩ |
| Qg (Gate Charge) typical | 120nC |
| VGS Range | ±20V |
| Power Dissipation | 170W |
| Maximum Junction Temperature | 175°C |
| Qualification | Automotive-grade |
| Package | D2PAK (TO-263 SMD) |
FAQ — AUIRF4905S MOSFET
Q: P-Channel vs N-Channel — when do I need each?
A: P-channel is for high-side switching (load between drain and ground, switch between supply and drain) — simplifies gate-drive when no boost circuit is available. N-channel is for low-side switching with simpler drive but requires a bootstrap circuit for high-side use. The AUIRF4905S is specifically the P-channel variant.
Q: How do I test a P-channel MOSFET?
A: Multimeter in diode-test mode. Probe source-to-drain: healthy P-channel shows ~0.5V body-diode drop with positive lead on drain, OL with reversed polarity. Shorted = ~0V both ways; open = OL both ways. Note polarity is opposite to N-channel testing.
Q: D2PAK rework?
A: Standard SMD reflow at 250°C peak with proper preheat. The exposed tab on the D2PAK must reflow with the PCB thermal pad — apply solder paste to the thermal pad before placing the device.
Q: Bulk pricing?
A: Yes — email contact@lys-sz.com for tray-quantity pricing.
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Repair benches stocking AUIRF4905S P-Channel MOSFETs in volume? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
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